How to do this????
Dear student,
We are given that in 40 seconds the athlete completer one round of the circle. We have to find the distance and displacement covered in 2 min 20 seconds that is equal to 120+20 seconds or 140 seconds.
Since the athlete covers 1 round in 40 seconds thus in 140 seconds he covers 140/40 = 3.5 round.
If he covers 3.5 rounds then the total distance is = 3.5 x perimeter of one round
distance = 3.5 x (2πr) Here r =diameter/2 = 100 m
Distance = 2200 m
For displacement after the end of 140 seconds the athlete reaches point B in the above image. The shortest distance which covers these points is AB = Diameter. So displacement = diameter.
Displacement = 200 m
We are given that in 40 seconds the athlete completer one round of the circle. We have to find the distance and displacement covered in 2 min 20 seconds that is equal to 120+20 seconds or 140 seconds.
Since the athlete covers 1 round in 40 seconds thus in 140 seconds he covers 140/40 = 3.5 round.
If he covers 3.5 rounds then the total distance is = 3.5 x perimeter of one round
distance = 3.5 x (2πr) Here r =diameter/2 = 100 m
Distance = 2200 m
For displacement after the end of 140 seconds the athlete reaches point B in the above image. The shortest distance which covers these points is AB = Diameter. So displacement = diameter.
Displacement = 200 m
Hope this information will clear your doubts about topic.
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